Malicious PDF — malware analysis report

Static analysis result for SHA-256 c27239536aa733da…

MALICIOUS

PDF

81.5 KB Created: 2021-06-10 09:37:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 8ac96325db3b0b742ec373a4248a3970 SHA-1: 526864787a503ee5f4e220f1f81087cbeeacf939 SHA-256: c27239536aa733da2aba6270c5b5830b7d4dfce4750fe5da60c33f7fce57c79e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged as malicious by ClamAV and an ML classifier. It contains an embedded URI pointing to 'synerhu.ru', which is presented in the document body as a 'Videobuddy new movie app' download. This suggests a phishing or malware distribution lure. The PDF structure and embedded URLs indicate it's likely part of a larger phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://synerhu.ru/pbw?utm_term=videobuddy+new+movie+app PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4389090/normal_60385acfca4e0.pdfIn PDF document text
    • https://tezigawoje.weebly.com/uploads/1/3/1/3/131379443/48c25e3f86.pdfIn PDF document text
    • https://jimagofer.weebly.com/uploads/1/3/0/8/130813953/sojam-joxut-komuwajarojo-bukulibofaj.pdfIn PDF document text
    • https://jajipovel.weebly.com/uploads/1/3/4/5/134527293/daket_zerupab_dotikonim_savubijebatok.pdfIn PDF document text
    • https://jurizimobijagi.weebly.com/uploads/1/3/0/8/130874317/darinum-makurodafoji-vumidu-gosusorenitul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410441/normal_601faff15c2b1.pdfIn PDF document text
    • https://pipamoximiketo.weebly.com/uploads/1/3/0/9/130969724/kijapabinesoj_xeredafa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424043/normal_5fdb41b946a33.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402948/normal_5fc82b8859bcd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zuwofig.pbworks.com/w/file/fetch/144646497/51102069552.pdfIn PDF document text
    • http://ditidema.pbworks.com/f/descargar_intros_editables_para_sony_vegas.pdfIn PDF document text
    • http://farejutotej.pbworks.com/f/57369316901.pdfIn PDF document text
    • http://zabodovojif.pbworks.com/w/file/fetch/145025790/kamyab_jawan_program_track_application_status.pdfIn PDF document text
    • http://gulisapil.pbworks.com/f/85204739045.pdfIn PDF document text
    • http://wijozuzapusa.pbworks.com/f/jofisuwowipuxogadujikeji.pdfIn PDF document text
    • http://fipivuzigoge.pbworks.com/f/gaduvuvaleduzijukerilol.pdfIn PDF document text
    • http://majemekux.pbworks.com/w/file/fetch/144798486/dateniwevomopeda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33e5fd56-f3d9-4eeb-acc4-c5daee34e114/22316295314.pdfIn PDF document text
    • http://nidibewuzi.pbworks.com/f/99648512218.pdfIn PDF document text
    • http://zekodunu.pbworks.com/f/audio_engineering_books_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10f56c4e-438c-44c2-a1b3-a2c2453ef620/47200492825.pdfIn PDF document text
    • http://wojipag.pbworks.com/f/12062453384.pdfIn PDF document text
    • http://xetibubib.pbworks.com/w/file/fetch/144425187/sebinokibulodajele.pdfIn PDF document text
    • http://giresizuloki.pbworks.com/w/file/fetch/144463293/48576495944.pdfIn PDF document text
    • http://munonoraze.pbworks.com/f/jajepepobureg.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF2 5160 bytes
SHA-256: 1329e0adcf2e2b8969487ac6de7196de147183db3674deefdbc3489048d787ef
font_01_sfnt_off00011186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11186 11024 bytes
SHA-256: f4bd2fc891f1468d3ab27dfc7c15563d39e626685c889f06d60fe1b0026d82ea

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